The bottom line is that all too often we are working hard installing relief valves on systems that can not be over-pressured, (physically impossible). These relief valves will never lift due to an over-pressure situation. Sizing a valve that will never lift is a farce. These useless valves...
I personally feel that wasting money, time, etc., installing relief devices on equipment that is inherently safe, (no credible over-pressure scenario / no liability), is a shame and reflects poorly on the engineering profession. It leads to contempt and ridicule. Unfortunately, I suspect that...
According to the engineering department at API Heat Trasnfer the tubes / tube sheets on the code stamped tube and shell heat exchangers that they manufacture are code. The U-1 form that they provide with the heat exchangers requires the owner to provide relief valve protection on both the shell...
Are all of the components mounted on the skid of a package centrifugal air compressor excluded from the ASME code? Typically centrifugal air compressor manufacturers install a tube and shell oil cooler on the air compressor skids of packaged compressor units. Most manufacturers do not relief...
We have a 15,000 gallon liquid nitrogen storage tank that is operated at 14 psig. The tank is enclosed in a vacuum casing under a full vacuum, therefore the outer pressure on the liquid storage tank is 0 psia. Under these conditions the net pressure on the liquid storage tank is 28.7 psi, (14...
I have three 1500 HP, 4160 volt, 60 Hz, 3600 RPM, horizontal Siemens induction motors that drive centrifugal air compressor. One of the three units has had a higher vibration level than the other two from the start. At initial start up the motor had a high 2X running vibration level. The...
